Preparation Of Ti Plate Electrode Coated By Ce Doped With Noble Metal Oxide And Its Electrolytic Treatment Effect For Coking Wastewater

For its characteristic of complex composition,high chroma and unfavorable for biochemical degradation,coking wastewater,as one of the wastewater from coal chemical industry,has attracted numerous attention in the field of treatment for refractory industrial wastewater.Conventional biochemical treatment for coking wastewater has a measure of effect,but it is unsatisfactory to meet the relevant criteria.Hence the realization of advanced treatment of coking wastewater and the effective prevention of water environmental pollution caused by its substandard treatment have significant meanings.These moves can answer the inherent needs of Chinese industrial development and inevitable requirements for water pollution control,but also its the firm realization process on the ecological civilization"Lucid waters and lush mountains are invaluable assets".The paper has studied the advanced treatment for coking wastewater by electrochemical advanced oxidation technology in view of the practical problem.And the effect of electrochemical water treatment has been studied systematically and multidimensional,such as the preparation and characterization of electrode materials,construction of electrochemical water treatment device,comparison of removal effects parameters values of COD,TOC and UV₂₅₄54 and analysis of types and abundance of organic substances in water accomplished by GC-MS.Ti/RuO₂-Ta₂O₅ and Ti/RuO₂-ZrO₂ electrodes doped with rare earth element Ce were prepared by thermal decomposition method,and the properties of the reinforced electrodes have been analyzed and compared.The surface morphology,main components,phase composition and electrochemical properties of the electrode were characterized by means of SEM,EDS,XRD,CV and LSV curves.Ti/RuO₂-Ta₂O₅-Ce electrode and Ti/RuO₂-ZrO₂-Ce electrode were employed for electrochemical oxidation of coking wastewater from biochemical effluent,respectively.GC-MS was used for detection for changes of organic components before and after treatment,and tendency of treated effluent such as COD,TOC and UV₂₅₄54 also have been compared.The results show that the structure and morphology of the electrode surface were optimized,specific surface area of the coating have been magnified,number of active sites on electrode surface have been increased,and the ability of anode to degrade organic pollutants in coking wastewater has been enhanced,after the introduction of rare earth element Ce.After electrochemical oxidation treatment,the contents of polyheterocyclic aromatic hydrocarbons and naphthenic hydrocarbons in coking wastewater have been reduced significantly,and it has been converted into monocyclic organic compounds and unsaturated chain hydrocarbons.Ti/RuO₂-Ta₂O₅-Ce electrode has the best degradation effect on organic matter in coking wastewater when the electrolysis time was 30min,temperature was 25?,pH was 7 and current density was 25A/cm²,the removal percentage of COD,TOC and UV ₂₅₄54 reached 97.0%,85.0%and 85.0%respectively under these conditions.The removal percentage of COD and TOC were 95.0%and 89.6%when the electrolysis time was 30 min,temperature was 25?,pH was 7,and current density was 10mA/cm².And the removal percentage of COD and TOC were 98.3%and 89.6%when the reaction time have been prolonged,the minimum of UV₂₅₄54 was 0.28 under these conditions.